| 摘要 |
<p>A pressure supply unit to supply pressure to a dispensing can, the unit being attached to a gas bulb (41). The unit has a chamber pressurised to the desired can pressure, and one wall of the chamber is a diaphragm (33) and connected to a needle valve (35) regulating gas flow from said bulb (41). A reduction of can pressure causes the diaphragm (33) to move the needle to release gas from the bulb (41).</p> |
